If you are up in elevation and not used to it- find a slope with about 1 or 2,000ft climb with a few slopes in it at about 10% and a cafe at the top. That would put you in the mood to tackle one of the hills round there.

I live at sea level and when I get to Higher altitudes- I spend a couple of days just doing a few rides with climbs before I tackle anything serious. Gives me more time to spend round the pool.